Heading into the 2011 model year, BMW is adding even more powertrain variants across its lineup. The most likely candidate for the U.S. market is the 550i xDrive sedan. The 407 horsepower twin-turbocharged V8 can send its 400 pound-feet of torque to all four wheels with the rears getting 60 percent of the grunt. The front-to-rear balance can be adjusted on the fly based on traction conditions, and if the car is cornering, more torque is sent to the back freeing up the fronts for steering force.
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